<template>
	<view>
		<view class="search-box">
			<uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="forward" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				//搜索的结果列表
				searchResults: [],
				// 搜索历史的数组
				historyList: ['a','app','apple']
			};
		},
		onLoad(){
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods:{
			//input输入事件
			input(e){
				// 输入的防抖处理
				clearTimeout(this.timer)
				this.timer = setTimeout(() => {
					this.kw = e
					//请求搜索列表数据
					this.getSearchList()
				},500)
			},
			//请求搜索列表数据
			async getSearchList(){
				// 判断搜索关键词是否为空
				if (this.kw.length === 0) {
					this.searchResults = []
					return
				}
				const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch', {query:this.kw})
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				// 存储关键词
				this.saveSearcHishtory()
			},
			// 点击跳转到详情页
			gotoDetail(item){
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' +item.goods_id
				})
			},
			// 存放关键词
			saveSearcHishtory(){
				// this.historyList.push(this.kw)
				const set = new Set(this.historyList)
				// 利用set数据进行数组去重
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				
				// 对搜索历史数据，进行持久化的存储
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},
			// 清空历史数据
			clean(){
				this.historyList = []
				uni.setStorageSync('kw', '[]')
			},
			// 点击搜索历史记录，跳转详情页
			gotoGoodsList(kw){
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		},
		// 处理关键词的先后顺序的问题
		computed: {
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
}

.sugg-list{
	padding: 0 5px;
	.sugg-item{
		display: flex;
		align-items: center;
		justify-content: space-between;
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		
		.goods-name{
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
		}
	}
}

.history-box{
	padding: 0 5px;
	
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	
	.history-list{
		display: flex;
		flex-wrap: wrap;
		
		.uni-tag{
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}
</style>
